absolute threshold

signal detection theory

theory predicting how and when we detect the presence of a faint stimulus "signal" amid background stimulation "noise" assumes there is no single absolute hreshold and that detection depends partly on a persons experience, expectations, motivation, and level of fatigue.

parallel processing

trichromatic theory

theory that maintains that the retina contains red blue and green sensitive color receptors that incombo can produce perception or any color. explains first stage of color processing developed by young helmholtz

pheromones

kinesthesis

the ability to feel movements of the limbs and . our vestibular sense relies on semicircular canals and vestibular sacs in the inner ear to sense our head, thus our whole bodys position and movement, letting us maintain our balance

relative motion

as we move, objects that are actually stable may appear to move. the nearer the object is to you, the faster it seems to move. objects beyond fixation point appear to move with you and the farther away the object is the faster they move. brain uses these cues to help determine the objects distance